Circular Linked List

It is just a singly linked list in which the link field of the last node contains the address of the first node of the list. That is the link field of the last node does not point to NULL rather it points back to the beginning of the linked list.

            Look at the Figure

A circular linked list has no end. Therefore, it is necessary to establish the FIRST and LAST nodes in such a linked list. It is useful if we set the external pointer (i.e. head pointer) to point to the last node in this list. From this conversion we can easily locate the FIRST node of the list. If head is the external pointer then

                                    Head  --->   ptr

Would indicate the START node in the list. The START and the LAST nodes of circular linked list with this conversion are shown in Figure

We declare the structure for the circular linked list in the same way as we declare it for the linear linked lists

                        Struct node

                        {

                                    Int num;

                                    Struct node * next;

                        };

                        Typedef struct Node node;

                        Node * start = NULL

                        Node * last = NULL

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